NAV - Vertical Chart Relief

Question 1

Why is Vertical Relief shown on aeronautical charts? (2)

Answer 1

1. It remains unchanged
2. It has unique features in a broad range of sizes which accommodate the differing accuracy requirements of route and pinpoint navigation

Question 2

What are Contours? (1)

Answer 2

Continuous lines drawn on maps of equal elevation

Question 3

What does space between Contour lines depend on? (3)

Answer 3

1. The scale of the map
2. The range of elevations displayed on the map
3. The units of measurement being used

Question 4

How is the Gradient assessed by the proximity of Contour Lines? (1)

Answer 4

The closer they are to each other, the steeper the slope

Question 5

What is a Spot Elevation? (2)

Answer 5

1. A dot position indicator with the elevation printed alongside it
2. It marks the location of the highest point

Question 6

What is a Form Line?

Answer 6

1 They are Contour lines, but where an accurate survey of the terrain has not been carried out
2. shown as broken (dashed) lines and indicate approximate elevations

Question 7

What is Tinting? (1)

Answer 7

The visual indication of vertical relief produced by contour lines may be enhanced by tinting the intervening layers

Question 8

What are Hachures? (1)

Answer 8

Short lines that radiate away from high ground

Question 9

What is Hill shading?

Answer 9

The simulation of a low sun angle casting shadows of high ground
2. Used for displaying vertical relief in areas where detailed surveying has not been completed
3. Most effective on relatively flat terrain (moorland/dunes)